| Konvekta Limited | Manufacturing | 1981 |
| Kosmic Dogs Grooming Parlour Ltd | Other services | 2024 |
| Krave Daze Ltd | Hospitality | 2026 |
| Kryptic Limited | Arts & recreation | 2021 |
| KT Digital Marketing Ltd | Professional & scientific | 2016 |
| L & S Freelance Truck Parts Limited | Extraterritorial | 2000 |
| L R Electrical Contractors Ltd | Construction | 2020 |
| L Retail Limited | Wholesale & retail | 2018 |
| L.C.L. Construction Limited | Administrative & support | 2003 |
| LA Lattè Lounge Ltd | Hospitality | 2023 |
| LAB Sass Sales Ltd | Professional & scientific | 2022 |
| Lady M'S Limited | Wholesale & retail | 2007 |
| Lakevue Holdings Limited | Financial services | 2026 |
| Lalande Properties Ltd | Real estate | 2021 |
| Lami-Cell UK Ltd | Wholesale & retail | 2021 |
| Lamppost Hospitality Ltd | Wholesale & retail | 2024 |
| Lamppost Hounds & Humans Limited | Wholesale & retail | 2018 |
| Lancashire BUS and Truck Parts Limited | Wholesale & retail | 2007 |
| Lancashire County Housing Ltd | Hospitality | 2026 |
| Lancashire Creative Ltd | Professional & scientific | 2024 |
| Lancashire Funeral Services Limited | Other services | 2016 |
| Lancashire National Removals Ltd | Transport & logistics | 2025 |
| Lancashire Sports Markings Ltd | Arts & recreation | 2024 |
| Lancs Lock-In Limited | Arts & recreation | 2017 |
| Landmark Residential Limited | Real estate | 2017 |
| Landmere Holdings Ltd | Real estate | 2024 |
| Laneside Garage Limited | Wholesale & retail | 1972 |
| Langdale Lettings Ltd | Real estate | 2018 |
| LASTAPAS131 Ltd | Hospitality | 2024 |
| Laura BAM BAM Love Ltd | Other services | 2023 |
| Laura Higginson Financial Planning Ltd | Financial services | 2022 |
| Laurel Investments UK Limited | Real estate | 2003 |
| Laurel Ridge Ventures Ltd | Professional & scientific | 2022 |
| Law Property Refurbs Ltd | Real estate | 2024 |
| Lawcomms Ltd | Professional & scientific | 2018 |
| LD Detergents Ltd | Wholesale & retail | 2025 |
| LDP Analytical Services Ltd | Professional & scientific | 2024 |
| Lead Developments Limited | Real estate | 2026 |
| Leafral Ltd | Wholesale & retail | 2025 |
| Leah Ventures Limited | Real estate | 2021 |
| Learning & Development Associates Ltd | Education | 2017 |
| Leebrook Motors Ltd | Wholesale & retail | 2021 |
| Lees Electrical Services Limited | Administrative & support | 2009 |
| Lege Artis Kancelaria Prawno Podatkowa Stanislawska Ltd | Other services | 2023 |
| Legionella Solutions Limited | Water & waste | 2015 |
| Lemon N Spice Ltd | Hospitality | 2024 |
| Leon Massey Limited | Transport & logistics | 2025 |
| Levira Training & Development Ltd | Education | 2026 |
| LI SAM Vicky Chiu Limited | Wholesale & retail | 2008 |
| Liam Spencer Art Limited | Arts & recreation | 2005 |
| Liberty Therapeutic Services Ltd | Education | 2026 |
| Lifestyle by Homecare Services (HCS) Ltd | Public administration | 2017 |
| Lift Growth and Business Transformation Consultancy Ltd | Information & communication | 2019 |
| Lift Personal Training Bolton Limited | Other services | 2025 |
| Lift Personal Training Ltd | Other services | 2025 |
| Lightside Ventures Ltd | Financial services | 2025 |
| Limitless Nutrition Ltd | Health & social care | 2024 |
| Lindars Consulting Limited | Information & communication | 2024 |
| Lingua Lessons Ltd | Education | 2026 |
| Linkedup Communications Limited | Information & communication | 2012 |
| Linkway Connect Limited | Information & communication | 2026 |
| Linkways (Blackburn) Limited | | 1973 |
| Little Blonde Bakes Limited | Wholesale & retail | 2020 |
| Little Blonde Wholesale Limited | Wholesale & retail | 2023 |
| Little Danethorpe Farm Limited | Agriculture & fishing | 2016 |
| Little Minds Education Limited | Education | 2017 |
| Little Monk Pictures Ltd | Information & communication | 2019 |
| Live MMA Ltd | Information & communication | 2022 |
| Live Well Community Health Care CIC | Health & social care | 2025 |
| Livero Limited | Construction | 2018 |
| Ljbpharm Ltd | Health & social care | 2025 |
| LMC the Laser Machine Co. Ltd | Wholesale & retail | 2025 |
| LMR13 Ltd | Real estate | 2026 |
| LMS Music Stars Ltd | Arts & recreation | 2025 |
| LN Real Property Ltd | Real estate | 2022 |
| Loch Fyne Hosting Ltd | Information & communication | 2025 |
| Lockandlook Limited | Administrative & support | 2025 |
| LONGWOOD18 Ltd | Other services | 1996 |
| Loom Properties Ltd | Real estate | 2025 |
| Lorama UK Limited | Manufacturing | 2024 |
| Lord Family Properties Ltd | Manufacturing | 1973 |
| Love Construction & Maintenance Ltd | Construction | 2024 |
| Loving Land Limited | Real estate | 2015 |
| Lower Pike Lodges Limited | Hospitality | 2025 |
| Lowmac Ltd | Real estate | 2022 |
| Lowpak Limited | Wholesale & retail | 2008 |
| Loxitek Ltd | Construction | 2025 |
| LPM Wall & Ceiling Systems Limited | Construction | 2023 |
| LRC Property Ltd | Administrative & support | 2023 |
| LSC Group Limited | Financial services | 2016 |
| LSC Holdings Limited | Extraterritorial | 2015 |
| LSC Investments Limited | Financial services | 2015 |
| LSC Property Holdings Limited | Real estate | 2020 |
| Lsvc Blackburn Ltd | Households | 2021 |
| Lsvc Boothstown Ltd | Other services | 2021 |
| Lsvc Haslingden Ltd | Other services | 2021 |
| Lsvc Rawtenstall Ltd | Other services | 2021 |
| Lsvc Recruitment Ltd | Health & social care | 2019 |
| Luca John Holdings Ltd | Financial services | 2024 |
| Lucas Communications Limited | Construction | 2007 |